Are the Starbucks staffed by Starbucks or Disney Cast Members?
Both locations are ran by Disney Cast Members.

Is the full Starbucks menu available?
Yes you can choose from the full Starbucks beverage menu. View here.

Can I buy Disney treats in the Starbucks?
Both locations offer a limited selection of non-Starbucks, Disney produced treats. Offerings include cup cakes, brownies and cookies. (View photos)

Can the Disney Dining Plan be used?
All beverages are eligible for snacks on the Disney Dining Plan, as are most baked goods. A DDP symbol next to each item indicates eligibility. Quick Service Meal credits can also be used for the breakfast sandwiches, which also includes a beverage.

Can I redeem My Starbucks Rewards?
Disney are not accepting My Starbucks Rewards at either location.